Drum trap



June 7 1927. 1,631,445

la'. WENSLEY DRUM TRAP Filed oct. 11. 1926 ll n - aha7@ Wand ley.

" 55 composed of brass,

,p l Patented. June'7, Y19.27. j

'i "happueaaonf '1aed october. 11,1926.:` serial no.v 140,835.

l invention relatesto in drumtraps of the' type described. and 'claimed ,in United States' Letters Patent No. 839,240.`

issued tojnielon December' 25, 119,06.' `j .i

i This t'ype'oftrapis extensively/used byV 'plumbers sin the installation of bath room liXtures and,for.other-similar-uses.

It is theobject of this'invention to -pro-.V vvideia trap havingY alead body provided n 1o with an open top and with a screwfcap for closing 'the same. VAn' internally threaded lring is secured to opening and the removable cap has an eX- ternal thread that cooperates with the inf' ternal threads of the ring.

Y One object of this invention is to provide a fluid tight seal between the body of the trap andthe capso as to protect the threads tentsof the trap. i Y

It is a further object of this invention to produce a trap in which a satisfactory seal is obtained WithoutV the use of a. separate.v f

- In orderto close the trap it is only neces-r Y* Y.

sary to 4screw the cap l() into therring` 6ta.' l1 1 packing Washer. p Y

Y It is a still further object ofthis` invention to produce a. construction in which the Amaximum sized opening can be obtained for `any given diameter of trap andthereby pro?v duce a trap that can .be more conveniently installed than traps of the same size differently'cons'tructed.

The above and other objects that may become apparent as this description proceeds -are attained byvineans of a construction and arrangement of parts that will now'be described in detail, reference for this purpose being had tothe accompanying drawing in which thepreferred construction has been illustrateda-nd in which: y

vFigyl .is a side elevation the cover in place; l p

Fig.4 2 is a vertical diametricalsection vthroughthe trap; c i

` Fig.v 3 is a fragmentary section similar to that'shown in Fig. 2, but to a larger scale, N the cover being shown in partlyl closed poy sition; and v Fig. 4 is a section similar to that shown in vthe cover in sealing position;

Let numeral 5 designate the body of the trap, which, as heretofore indicated, it will be assumed, is composed of lead or similar lsoft metal. A-ring', which is preferably is provided with an interiorly projecting depending flange Vfrom the corrosive action ofthe gaseous con of ,the trap Vwith l Fig; 3 but to a still larger scale and shows.'

1 terial.

flange or` ledge 7. The

interior surface offthis ring, above thellange isthreaded as; shown aty 8-to engage 'eXter-. ior threadsonthe depending flange 9,1Wh1jch is formed on, and constitutesan integral portion of the cap or closure 10Q;-

diameteris `the samejas theiinterior "diameter ofthe flange 7.V This permits the rlng 6 flange 7 in contact with the 'exterior of the body. The extreme `upper portion of the body is then bent outwardly on top of'flange 7 and pressed or'spun against the threaded to vbe putrinto place With the-interior 'of the body of the t-rap at the portion-ofthe ring. The Vlower edge of the l is provided with y p p indent the portion 13 of the' body of the trap Whr'ch lies above the flange 7 The part 9.of the cap or closure lO'`Y a thin edge'lQ 'adapted to z 75 13 of thevbody of the trap really forms a y packing Washer and is an integral part of the jbody.

sufficientl 'distance to bring the sharp edge 12 Vinto contact With the soft metal part13 of thetrap. This makes a fluidtight jolnt andV prevents the contents of the trap from coming in contact Vwith the threads. x

I will now call particular attentiontotone l Y feature of the construction that. is of great importance andto which this invention 1s particularlydirected. In the installation of traps of this kind, the plumber is required to attach certain pipes to the body kmember,

this makes itnecessary forhim toinsert hishand into the trap. Itis therefore necessary that the smallest linternal diameter shallbe.`

mum diameter but this will add to the size To jincrease the diand cost of the trap. It is evidenty that by f making-the difference between the internal diameterof the `body member and the diamf 4` eter atthe neck or diameter D (Fig. 4L),asv

small as possible, the desired results may be obtained Withthe minimum amount ofma-i In order .that diameter D sha-ll` be` as large as possible,I have formed thesha-rp edge 12'of flange 9 as near to the outside as@ possible. edge 12 .The maximum i diameter s of the!" that is practicable is the root di. ameter of the threads on the-k outsideA ofthe A` l2 s sides of the threads and could not be Amade Continuous. By constructing the lower endVv of the fiange with the Yedge 12 lin line with the cylindrical Surface representing the root diameters of the threads,l the internal projecton of flange 7V canbe made as smallas desired and the diameter D will thereby be made larger than it would be possible to make it 'if the diameter of Vthe cutting edge were smaller. f

Having` described the invention what is claimed as new 1s:

A structure of the class described, havingr a' cylindricaly member formed from soft metal, one end of wlnoh is closed and forms the bottom and the other endof'Whiohl is open, an internally threaded ring surroundlng the upper portion .of the body of the ing flange over Whieh the top of the structure is bent and a cap or closurey having a vdepending Hange externally threaded to engage the interior threads of the ring2 the bottom of thetlange of Lthe Capr being pro-r- Vided with a, thin edge adapted to indent that portion'of the body of the structure whichis engaged by lthe llange of thering, saidvthln edge having a'diameterSubstantially equal the root diameter vof the threads on the depending flange. and formed in part lby a Continuation of'saidexternal thread.

In testimony whereof I afliX my signature."v

RioHAnD WENSLEY.

structure and'having an interiorlyproject-` Y 

